Abstract
A narrow state has been observed in the reaction Σ − + Be → ( ΛK − π + π +) + X in an experiment at the CERN SPS hyperon beam. At 2.46 GeV/ c 2 the effective ( ΛK − π + π +) mass distribution shows an excess of 82 events above a background estimated to be 147, corresponding to a statistical significance of more than 6 standard deviations. The positive charge of the observed final state, which has strangeness −2, suggests the interpretation as a Cabibbo favoured decay of the charmed strange baryon, A + [quark content (csu)]. The cross section times branching ratio is measured to be σ · B = (5.3 ± 2.0) μb/ (Be nucleus) for x > 0.6. The invariant production cross section is described by E d 3 σ/d p 3 ∞ (1 - x) (1.7±0.7) exp[−(1.1 −0.4 +0.7) p T 2].
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